Turbomachinery for Nitric Acid Plants - MAN Diesel & Turbo

Quality assurance
MAN Turbo’s QA programme is the
basis for the reliability of the company’s
high-quality products. The QA division,
which reports to the Chairman of the
Executive Board, initiates, coordinates,
and monitors all activities affecting quality,
while also issuing, and controlling
the compliance with, QA Manuals and
Procedures, such as:
Design
Material procurement
Production planning
Fabrication
Functional tests
Procedural qualifications
Calibration of gauges and test
equipment.
The main features of an inspection plan
for a nitric acid machine train are:
Destructive testing of specimens
taken from workpieces of the following
components:
- machine casings
- inlet rings
- volutes
- nozzle segments
- stator-blade carriers
- shafts
- impellers
- rotor and stator
- blades
- labyrinth seals
- control-valve/nozzle
- chests
- trip valve internals
Ultrasonic examination after rough
machining and finish-machining of
- cast steel casings
- impellers
- shafts
- rotor and stator blades
- inlet and control-valve/ nozzle
chests
- nozzle segments
Magnetic-particle testing of
- machine casings
- rotor and stator blades
- stator-blade carriers
Due penetrant examination of
- machine casings
- shafts
- impellers
- rotor and stator blades
- stator-blade carriers
Radiography of machine casings
Dimensional and visual examination of
- machine casings (pre-machined and
finish-machined)
- shafts and rotors
Heat stability test of shafts
Hydrostatic testing of casings
Overspeed testing of impellers
Run-out measurement on rotors
Balancing of rotors at operating speed
Clearance measurements on assembled
machines.
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